package string;

import day04.ForDemo;

public class StringAndStringBuilderDemo {
    public static void main(String[] args) {
        StringBuilder builder=new StringBuilder("a");
        for(int i=0;i<=10000000;i++){
            builder.append(i);
        }
        System.out.println(builder);
        System.out.println("执行完毕");
    }


}
